Stoves and furnaces – Heaters – Lunch
Patent
1983-04-04
1985-03-26
Focarino, Margaret A.
Stoves and furnaces
Heaters
Lunch
126261, 44 76, A47G 2304
Patent
active
045066540
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a heating device for heating liquid and solid products.
A number of different types of devices comprising a container structure and a heating element, i.e. so called self-heating containers, have been previously proposed, which include a substance capable of giving rise to an exothermic reaction, so that when the reaction occurs the contents of the container are heated.
It is known from the literature that the burning time of a heating element depends not only on the composition which is used, but also on the heat conductivity characteristics of its receptacle and how the heat produced by the reaction is extracted from the mass. In order to control and to increase the duration of the reaction, it has been proposed to embed, in the exothermic combustible material, internal walls or partitions of some refractory material reaching from the top to the bottom of the heating element and insuring a fire path.
Some devices of this type are dangerous to operate, since the heating element is not insulated from the surroundings or may be separated from the container and then actuated. As a result the heat flow produced is not absorbed by the container and its contents, but rather is directed towards the surroundings.
As the heat produced in such heating devices, particularly those of the thermite type, can have an extremely high temperature value, up to 1200.degree. C., such devices are dangerous to handle manually and may cause fires or explosions. In addition, previously proposed arrangements have not satisfactorily heated the contents of the container in a uniform manner, nor have they been convenient or simple to use.
It is an object of the present invention to provide a heting device which comprises a suitable structure allowing a proper heat dissipation to the contents of the container or food preserve and providing uniform heating thereof whilst insuring complete heat insulation to the surroundings and therefore great safety in use.
Another object of the present invention is to provide a heating device that includes a relatively simple and safe ignition arrangement for the combustible material which is reliable in use and which requires no special accuracy in manufacturing.
A further object of the present invention is to provide a heating device which is cheap to manufacture for its manufacturing can be automated.
A still further object of the invention is to completely separate the conditioning of the food into a sterile packaging and the manufacturing of the heating element, both being assembled as completed units.
Yet another object of the present invention is to provide an improved exothermic gas-less composition in liquid or semi-liquid form by the use of a liquid binder for it is well known that it is much easier to handle a liquid or a paste rather than powder. The use of liquids or pastes allow to get cakes of composition with a fully controlled porosity and this for any shape which can be casted, while powders can only be compressed to a given porosity or density in very limited shapes such as cylinders. It is well known from the pyrotechnicaL art that the porosity of a pyrotechnical reactive mass is determinant for its burning speed.
In order to realize these objects, the invention provides a heating device for heating liquid and solid products comprising a container structure and heating means located at the base of the container structure, said heating means comprising a heating element including a supply of exothermic gas-less combustible material, containing internal walls defining at least one fire path, which heating device is characterized in that said heating element consists in a flat tile like element comprising a heat spreading layer made of heat conducting material, an intermediate layer composed by said exothermic gas-less combustible material and containing said internal walls and a layer of heat insulating incombustible material. Ignition means are connected to said combustible material through an opening in at least one of the layers encasing the combu
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Spreter Victor
Zellweger Conrad
Eslinger Lewis H.
Focarino Margaret A.
Pozel S.A.
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